338 lapua velocity vs low powder charge

[Precisiondirt]

Hey guys, new to the forum but have been reloading for quite awhile. I have a savage 110 bad that is a very early model. I purchased about 2 months after they were released and am well aware they were prone to tight chambers. The question is how tight? And how much will it affect velocity vs powder charge?
My load right now is 90 gr of retumbo, lapua brass, fed 215 under a 250 gr lapua scenar. This is a manual starting load but it crono's right about 2870fps witch is over the manuals max of 2853fps. Extraction is ok, no noticeable ejector swipe but the fed 215's are pretty flat. Brass has about 4 loadings and the only thing I haven't checked is brass neck thickness.

My 300gr scenar load is same way. A starting load of 86 grs of retumbo gets me a almost maximum of 2640fps.
The question is should I be worried that I'm pushing it too hard? Only pressure sign is flat primers.
Any thoughts?

 

[Precisiondirt]

Nothing........?

 

[el matador]

Lapua brass is really hard and won't show the typical pressure signs around the case head until you're significantly over the SAAMI pressures. The neck/shoulder area is still going to be soft brass though, so you will likely notice a bit tougher extraction as you get up there in pressure. A little primer flattening is not a big deal. If you're happy with the velocity and accuracy go ahead and run it!

 

[Precisiondirt]

Ok. Accuracy is .5s - .6s moa and shoots pretty consistent. The primer flattening was my biggest worry considering it's a touch over hogedon max velocity. I see many guys run much faster but I not chasing speed just consistency.

 

[Precisiondirt]

This is what they look like. Primers are not consistently flat with the far left being the worst. The right is average. Would anyone worry about this?

 

[el matador]

Those primers are not very flat. I would guess your pressures are pretty close to what a max load would be but nowhere near dangerous. I've seen primers much flatter than that during load development.

 

[Precisiondirt]

Thanks for the reply. I appreciate the help.