Wilson Combat 300 Hammer is now SAAMI accepted.

[brando]

[Popeye212]

Forgive me brothers for I hath sinned. Built a 300Hamr upper with their 16" barrel that was on sale for $149. My son built one so I had bought the dies to load for his. So due to deductive reasoning I "needed" one for load development (Besides it was on sale I saved money }. Sight in yesterday yielded 2401fps average with 11.8 SD 135 gr BT factory load. Waiting for brass to dry to load a few 150gr Speer Hot Cor. This was was sight in and getting some brass. I will try to post some legit group tests.


300hmr135gr(edited-Pixlr).jpg

[brando]

https://www.etsy.com/listing/791075711/300-hamr-cut-off-trimming-jig-auto?ga_order=most_relevant&ga_search_type=all&ga_view_type=gallery&ga_search_query=300+hamr&ref=sr_gallery-1-1&organic_search_click=1&frs=1

[Old Bob]

https://www.etsy.com/listing/7910757..._click=1&frs=1

It's not that hard to do if you have the right equipment. I have a mini cutoff saw I got at Harbor Freight to convert .223 Rem/5.56mm NATO brass to 7.62X40WT cases. It comes with its own holding clamp that has a v-shaped grove in it that will hold the brass steady while I cut it. However, I also ordered the 300 ham'r cutoff jig 'cause it looks like it will make the job even easier. I can live with the longer cutoff... the Blackout jig would cut the brass too short. I also ordered a RCBS primer catching device for my Rock Chucker press & a brass shavings catcher for my RCBS case trimmer. Always looking for things or ways to make some jobs less tedious.

[LRRPF52]

[Old Bob]

I don't have a 300 HAM'R but I do have a 7.62X40WT also made by Wilson Combat. Yup, the 300 HAM'R will require mags for the 300BLK or modified .223 Rem/5.56 NATO mags. I have some of both... the PMAGs & modified Lancer mags sold by WC. The modification is the milling down of the first ribs at the front of the mag to compensate for the wider 30 cal bullets.

From my experience with these mags, the feed ramps on my Wilson Combat barrel & various bullets I've used for reloads, it really functions quite well. I've had no issues at all feeding ammo from those mags. I've even used blunt, round nosed 110gr 30 Carbine bullets & they functioned perfectly. I thought they might hang up at the feed ramps but they don't. However, I must add YMMV. They work in my rifle... I can't say they will in all rifles.

[Texcl2]

[brando]

[Klem]

This is a familiar issue across AR calibres. You need more gas or a lighter buffer system. Sounds like it's easier to drop the buffer weight.

[Texcl2]

[brando]

[Texcl2]

[brando]

[Texcl2]

[sneaky one]

I have the 7.62 x 40 from wilson. It was the original start of making the 300 HMR. It runs best with a std. wt buffer., or 1 that's a bit lighter. Std. spring is fine.