I'm working up some 90 gr loads for my new 18" Grendel.
I took one of the Federal-90's apart to look at it.
The TNT bullet they are using has a cannelure whereas the TNTs in my box of 100, do not. Otherwise overall length, look and shape they are the same when laid side by side.
The powder measured 29.7 gr, looks kind of like H335 or maybe CFE, the silvery/dark flat pellet-like appearance. (I put the round back together before taking any pix, sorry.) I'm pretty sure it's not either of them... the advertised velocity is 3000 f/s - probably 24" barrel, but I don't have any 29.7-ish powders that could do that...
COAL for 3 measured 2.183, 2.178, 2.182, with a slight crimp into the cannelure.
Anyway, just a little info on them.
My loads are going to be H335, Hornady new brass with cci450, loaded 2.180 so they will be similar in length to the Feddies. 30.6, 30.8, 31.0, 31.2, 31.4, 31.6 gr.
My OBT estimation routine can't find one in the book-powder ranges any higher than ~2790 (24") or est. 2700 for 18" barrel. So I'll see what results come out of the shooting...
If I find a good grouping then I'll chrono it after some validation.
I'm trying to find a 90 gr combo that comes close to the Federal one or else one that shoots well out of this barrel for predator hunting, the Fed-90 gives me ~0.8-1.0" at 100 yds so far, at ~$0.97/round. This barrel is the 18" grendel hunter, 1-8/5R SS barrel I got recently (bought it as an upper assembly).
I took one of the Federal-90's apart to look at it.
The TNT bullet they are using has a cannelure whereas the TNTs in my box of 100, do not. Otherwise overall length, look and shape they are the same when laid side by side.
The powder measured 29.7 gr, looks kind of like H335 or maybe CFE, the silvery/dark flat pellet-like appearance. (I put the round back together before taking any pix, sorry.) I'm pretty sure it's not either of them... the advertised velocity is 3000 f/s - probably 24" barrel, but I don't have any 29.7-ish powders that could do that...
COAL for 3 measured 2.183, 2.178, 2.182, with a slight crimp into the cannelure.
Anyway, just a little info on them.
My loads are going to be H335, Hornady new brass with cci450, loaded 2.180 so they will be similar in length to the Feddies. 30.6, 30.8, 31.0, 31.2, 31.4, 31.6 gr.
My OBT estimation routine can't find one in the book-powder ranges any higher than ~2790 (24") or est. 2700 for 18" barrel. So I'll see what results come out of the shooting...
If I find a good grouping then I'll chrono it after some validation.
I'm trying to find a 90 gr combo that comes close to the Federal one or else one that shoots well out of this barrel for predator hunting, the Fed-90 gives me ~0.8-1.0" at 100 yds so far, at ~$0.97/round. This barrel is the 18" grendel hunter, 1-8/5R SS barrel I got recently (bought it as an upper assembly).
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