243 Velocities?
- Thread starter Moose360
- Start date
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You are the only one that knows if it will be safe in your rifle. If there's no pressure signs, then you could work your way up to 42gr. I think 3345fps with a 75gr in an 18" barrel is smoking. I maxed out around 3550fps in a .243 with a 26" barrel running IMR 4350. I would say you have to be really close to max right now or you're already at very high pressures. I would be happy with where you are and would be focusing on precision and consistency at this point.
I was wondering too, not having experience with AR rifles...do you read pressure like normal or is there considerations to be taken for the action?
Thank you Sir. Exactly what I was looking for.
Calvin45
Well-Known Member
Out of an 18 inch semi auto I wouldn't be disappointed with that but it wouldn't surprise me if you could go a little faster yet.I'm loading 75gr Speer Varminter bullets behind 41.5gr of H4895 for my 18" barreled AR10. The chrony averages 3345. Is that decent for a 75gr bullet or can I bump it up to 42gr safely in a (full)semi auto?
Least helpful answer ever
Muddyboots
Well-Known Member
Speer data on line does not show data for a 75 Speer bullet and H4895. Hodgdon data is for Hornady 75 gr which is not identical.
2nd least helpful.
2nd least helpful.
Gary in MD
Well-Known Member
That's not too bad of velocity for that short of a barrel. If it is accurate then leave it alone. You won't gain much performance by increasing.
