Loading for AR, primer question

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Loading for AR, primer question

Postby Kiss of Death » Sun Feb 09, 2020 6:04 pm

The published load data for the 450 Bushmaster (from Hodgdon) uses Winchester small rifle primers. Would it be correct/advisable to switch to a CCI 41 for use in an AR-15? How much noticeable impact would this change have on the load (is it enough to require that I should start lower)?

(loading Barnes 275 TSX with Hodgdon H110)
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Re: Loading for AR, primer question

Postby Al in Mi » Mon Feb 17, 2020 6:53 am

Don't know where that #41 stacks up for "hotness", have heard/read the cup was a bit thicker or harder, but all I use anymore is the CCI 450 which has worked flawless in any loads I've tried over the years.
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Re: Loading for AR, primer question

Postby plant_one » Mon Feb 17, 2020 2:01 pm

anytime you change a component, you need to do at least a partial workup to make sure nothing changes for bad.

i believe the rule of thumb is back up 10% and work back up from there for basic testing on any unproven load in your firearm.

at the very least i'd want to back down 5-7 steps at 0.5gr intervals from your current load and reshoot the top part of the ladder to check for velocity and pressure changes
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Re: Loading for AR, primer question

Postby Hoot » Tue Feb 18, 2020 11:47 am

plant_one wrote:anytime you change a component, you need to do at least a partial workup to make sure nothing changes for bad.

i believe the rule of thumb is back up 10% and work back up from there for basic testing on any unproven load in your firearm.

at the very least i'd want to back down 5-7 steps at 0.5gr intervals from your current load and reshoot the top part of the ladder to check for velocity and pressure changes


+1

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