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+--- Thread: While I was waiting on reloading supplies, this happened. (/showthread.php?tid=21692)
While I was waiting on reloading supplies, this happened. - koger - 07-22-2020
Finally got time to shoot my CZ 6.5 Grendel yesterday. I had shot it once before, with some factory Hornady ammo, and was hovering around 1/2". I had picked up a couple of boxes of Federal Fusion, on a impulse buy while waiting on my reloading supplies to arrive. First 3 were about 3/4" so I was happy, that all left when the next 3 went into 4"! It just got worse as we went along, it obviously hates this load. I will be trying the 120sp Sierra when dies gets here, has to do better than the factory. Anybody have any H4895, Varget, or such loads with these powders and the 120 gr.
While I was waiting on reloading supplies, this happened. - A5BLASTER - 07-22-2020
I use h4895 with the 129 ablr in my CZ grendel, never tryed it with 120's did try some 123 eld-m's with it but ar-comp did better with them.
When you tryed the fusion. Was it continues shots?
Wondering if the barrel just got to hot after the first 3 shots causing the next shots to open.
My CZ does that after 5 are so shots of my 129 ablr load, if I don't give it a few mints between groups.
While I was waiting on reloading supplies, this happened. - koger - 07-23-2020
I was giving it 5 minutes between each group. I probably found out what the problems were with it today. I never shoot a bolt rifle till I bed it, float the barrel, it would have been wise to do that with this rifle. The tip of the stock was touching on the right side of the barrel, and about halfway up the barrel channel on the left side. The stock screw was not very tight and you could see the action had been moving slightly. I got mad at myself for not checking it the first time, and I expected a CZ to be partly bedded at least. I floated the barrel, and bedded the action from the front of the magazine to the end of the chamber. It also had a steel pillar in the back hole of the stock that was loose, I also bedded that in. I will try it again tomorrow and see how it does, I expect it will be some better.
While I was waiting on reloading supplies, this happened. - A5BLASTER - 07-23-2020
koger Wrote:I was giving it 5 minutes between each group. I probably found out what the problems were with it today. I never shoot a bolt rifle till I bed it, float the barrel, it would have been wise to do that with this rifle. The tip of the stock was touching on the right side of the barrel, and about halfway up the barrel channel on the left side. The stock screw was not very tight and you could see the action had been moving slightly. I got mad at myself for not checking it the first time, and I expected a CZ to be partly bedded at least. I floated the barrel, and bedded the action from the front of the magazine to the end of the chamber. It also had a steel pillar in the back hole of the stock that was loose, I also bedded that in. I will try it again tomorrow and see how it does, I expect it will be some better.
Yea my wood stock that came with my CZ had the same floating piller on the rear screw.
Soon as I took it out the box it went in a bell & carlson stock, much better for groups then the wood stock.
While I was waiting on reloading supplies, this happened. - riuma - 07-25-2020
My Standard CZ American purchased a few falls back gave me fits until I pillar bedded and floated. I then got rid of the awful CZ trigger. Shoots as good as I can hold it with Sierra 120 Pro Hunters and SW Match Rifle. No barrel heating issues.
My CZ Varmint purchased this past spring has an entirely different bedding system, straight from the factory, and shoots bug holes right out of the gate.~Riuma
While I was waiting on reloading supplies, this happened. - Rayatphonix - 07-26-2020
My heavy barreled CZ does very well with 8208-XBR and bullets in the 120 to 123 grain range. My rifle is bedded and it shoots fine with a hot barrel. It was in the mid-90s last week and I would shoot 15 rounds before cooling.
While I was waiting on reloading supplies, this happened. - riuma - 07-27-2020
8208-XBR is one of the few powders I have not tried in the Grendel/CZ. I thought CFE223 was the ticket and then H335. Ran BLc-2 and was about to delve into the XBR when I hit on Match Rifle.I just never found a reason to go any further. What kind of speeds are you getting, do you know?~Riuma
While I was waiting on reloading supplies, this happened. - Rayatphonix - 07-28-2020
I believe Im getting somewhere between 2450 and 2500 FPS with 120 grain Nosler BTs. Im planning to chrono loads this coming weekend and will post the results. Ive tried CFE223, RL15 and H335 and 8208 was clearly the best powder with these weight bullets.
While I was waiting on reloading supplies, this happened. - riuma - 07-29-2020
I look forward to your results.~Riuma
While I was waiting on reloading supplies, this happened. - koger - 07-29-2020
Well after bedding the rear pillar, and bedding the action from in front of the magazine, to the end of the chamber, floating the barrel the rest of the way out,problem solved. I shot 5 factory rounds, into 3/4", 5-85 gr Sierras into one hole that was about .375, that is total spread not center to center! I shot a 3 shot 120
sierra SP into about the same exact group/impact, with the barrel cool, and went back to it when the barrel was hot, and it went into a tad over 1/2", again I am talking extreme spread, not center to center. This was with a dirty barrel, fouled after the last shooting session, and left alone. I can send pics if anyone wants to post them. I am a happy camper.
While I was waiting on reloading supplies, this happened. - riuma - 08-01-2020
Excellent. I never clean my bores unless I get foreign matter in them, and then olly with a light drop of oil on a patch, then patched dry.~Riuma
While I was waiting on reloading supplies, this happened. - Rayatphonix - 08-02-2020
riuma, chronod my load today. Load was 28.0 grains XBR 8208 for both loads. Hornady brass. Shot out of a CZ 527 with a 22 Lothar Walther barrel.
123 gn Nosler CC. 2.230 COL. 2521 fps, 5 SD
120 gn Nosler BT. 2.240 COL. 2512 fps, 17 SD
The BT is my deer load and I had always figured about 2500 fps. CC is my practice round and Im surprised I got better velocities and less SD but it is what it is. I chronod 5 of each.
While I was waiting on reloading supplies, this happened. - riuma - 08-02-2020
Looks like you're set. I'm assuming accuracy was good? That difference in speed might have evaporated with a longer string.~Riuma
While I was waiting on reloading supplies, this happened. - Rayatphonix - 08-03-2020
Both bullets shoot about a 3/4 group. Watching the monitor, I think I could shoot again and the BTs would still be a bit slower. No rounds equals the CC speeds. Perhaps Nosler understands; not sure I could explain it.
This is why I never chase speeds with my chronograph. I find a good group and move on. For both loads Ive been assuming 2500 fps when trying to figure out drop and for my purposes, Ive confirmed thats a good speed.
While I was waiting on reloading supplies, this happened. - riuma - 08-03-2020
Rayatphonix Wrote:This is why I never chase speeds with my chronograph. I find a good group and move on. For both loads Ive been assuming 2500 fps when trying to figure out drop and for my purposes, Ive confirmed thats a good speed.
I am much the same. I have an idea of what the speed should be by way of the data and then if the loads turn out to be exceptional in some way, I'll chronograph a 10 shot string. It was only by chance that i chronographed my Match Rifle 120 grain load. It was exceptionally accurate and I was planning on running some 6.5 Creedmoor loads over the Labradar so I dragged the CZ Grendel out. I was actually not far off the data at 2690 fps. The data has max velocities at mid 2600. Add extra barrel length and I was in the ball park already, I guess. That extra speed doesn't offer a lot of practical advantage but it was interesting to find out it was there.~Riuma