Talking Primers

[tracker12]

Has anyone did any in-depth testing on the effects of different primers. I can see it might make a difference in a hight accurate bench gun but can I really expect to "measure" the difference in an AR platform.

[Bfglowkee]

[tracker12]

Makes sense. Thanks.

[SightedIn]

CCI 450s and 41s can be used interchangeably as far as loads, verifiable on CCIs website. But the 41s have thicker cups to prevent slam fires

[StoneHendge]

I have found that the difference in "hotness" between brands can make a measurable difference in accuracy. I generally use Federals by default since I find them easier to work with. Nonetheless I wasn't getting what I thought I should be getting with GM210Ms and H4350 in my creedmore. Tried BR2's (a little "cooler") and there was a measurable difference in group sizes.

[OpFor1]

From my personal experience with loading 556 ammo with Federal primers for an AR-15, slam fires are absolutely a legitimate threat!
Stick with the recommended primers in semi autos.
Huge safety warning from personal experience. Don't use Federal primers.

As far as accuracy goes using different primers, you may or may not see it. It depends on how accurate your barrel wants to be.
If it makes a difference to your weapon and load, you might be talking a half inch at 100 yards difference.
Or possibly no difference at all. Wont know till you try.

[StoneHendge]

From my personal experience with loading 556 ammo with Federal primers for an AR-15, slam fires are absolutely a legitimate threat!
Stick with the recommended primers in semi autos.
Huge safety warning from personal experience. Don't use Federal primers.

As far as accuracy goes using different primers, you may or may not see it. It depends on how accurate your barrel wants to be.
If it makes a difference to your weapon and load, you might be talking a half inch at 100 yards difference.
Or possibly no difference at all. Wont know till you try.

We're your slam fires with the 200s which are 0.019" thick and not recommended for semis, 205Ms which are 0.0225" thick, or 205MARs (AR Match) which are 0.025" thick and also harder?

[Mad Charlie]

Slamfires in AR and M1A platforms can sometimes be brought on by too much/wrong kind of oil on firing pin. They need to be lightly lubricated and wiped nearly dry with a non gumming/freezing lube. The channel needs to be clean too.

Slip2000 EWL has many advocates.

As far as different primers, it's hard to say. I did a limited test in my 5.56 AR a few years ago between 41's and 7.5's at 200yds. Load was 24.8 RL 15 under 69SMK in Rem cases, the 7.5's seemed to run a little tighter/rounder, but not by much.

[Popeye212]

I have found that the difference in "hotness" between brands can make a measurable difference in accuracy. I generally use Federals by default since I find them easier to work with. Nonetheless I wasn't getting what I thought I should be getting with GM210Ms and H4350 in my creedmore. Tried BR2's (a little "cooler") and there was a measurable difference in group sizes.

I've been using 450's in the sp Starline brass and getting excellent results.

20190211_123655 (Small).jpg

The Grr gives the best SD's so far with 450's also

5 shots 130 Sierra Game Changer .271 MOA

[Mad Charlie]

Woo Hoo bud! that's doin' some shootin'!

Do you feel comfortable passing that load on?

[Popeye212]

T/C Compass 6.5 Creedmoor 130gr. Sierra GameChanger, CCI450 Starline brass 3rd firing. .001 Shoulder bump OAL 2.825 BTO 2.268 43.6 H4350. Work up to this it is a warm load. looking at my notes it actually came out at 1.61 not .271 is what I have written down. .271 was the Grendel with 120gr. PH. Don't have a velocity on it have got more ordered will have a chrono on it next week.

[Mad Charlie]

I am definitely interested in your load for the PH in your Grendel, just got a few boxes and haven't had time to work with them yet.

Some great shooting outa that Creed!

[Popeye212]

Uh Oh I have a misprint that was a 120 MATCHKING. Best I could do with the PH was .770 with around 28.0 of 8208. Guess I need to apply at CNN and NY Times.

[Popeye212]

Bet i'm a shoe in for MSNBC

[Mad Charlie]

Nah...those people (I use that word broadly) do it on purpose and with malice.

Thanks