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<blockquote data-quote="Legendary350" data-source="post: 3860699" data-attributes="member: 51321">The one concerning thing is that lower velocities will lead to higher pressures with same weight projectiles (all else being equal). If the bullet seating depths result in the same volume within the case, which your charges of 28.5 gr. would suggest (XTP, HST and now the GD), then only friction is left as a major variable. In that case lower velocities would be due to higher friction. If effective case volume is equal, I would expect that the lower velocities would result in pressures that are significantly higher, on the order of 5-10k, the same general effect as bumping up projectile weight to 170-180. If the case volume is varying due to different seating depths, then all bets are off. Since I&#039;m loading for an AR, I don&#039;t have the flexibility of seating depth that you do. I&#039;ve also seen enough weird data with regards to Lil&quot; Gun so that I&#039;ll be staying away from it for this cartridge.I&#039;m loading for an 8&quot; barrel, so I&#039;ll be using slightly faster powder. I&#039;m currently working with Enforcer, but I&#039;ll go to AA #7 or 572 with lighter bullets if necessary.Stay safe.</blockquote>

[QUOTE="Legendary350, post: 3860699, member: 51321"] The one concerning thing is that lower velocities will lead to higher pressures with same weight projectiles (all else being equal). If the bullet seating depths result in the same volume within the case, which your charges of 28.5 gr. would suggest (XTP, HST and now the GD), then only friction is left as a major variable. In that case lower velocities would be due to higher friction. If effective case volume is equal, I would expect that the lower velocities would result in pressures that are significantly higher, on the order of 5-10k, the same general effect as bumping up projectile weight to 170-180. If the case volume is varying due to different seating depths, then all bets are off. Since I'm loading for an AR, I don't have the flexibility of seating depth that you do. I've also seen enough weird data with regards to Lil" Gun so that I'll be staying away from it for this cartridge. I'm loading for an 8" barrel, so I'll be using slightly faster powder. I'm currently working with Enforcer, but I'll go to AA #7 or 572 with lighter bullets if necessary. Stay safe. [/QUOTE]

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