I use 2225 & RL33 behind the 90s in my 1-7 twist but velocity is a little high, as the ambient temperature gets up they can't cope.
2209, 2213 & 2217 would be worth a look at, I prefer the slower powders.
Google 22-243 Middlestead
I use 2225 & RL33 behind the 90s in my 1-7 twist but velocity is a little high, as the ambient temperature gets up they can't cope.
2209, 2213 & 2217 would be worth a look at, I prefer the slower powders.
Google 22-243 Middlestead
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