Reloading semiauto rifle-- A few questions

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python125

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I am reloading for a Sauer 303 (semi auto rifle), chambered in 9.3x62.

I am using a Cutting Edge Bullet and the manufacturer of the bullet provided me with reloading charges.

They suggested I try H4350 but that load was so compressed that the bullet wouldn't seat properly.

So I tried imr4895. I started with the minimum loads and worked up. The majority of the loads were compressed loads.

here are my questions?

1) Many of the loads, even the starting loads had a bent case mouth. Is this a pressure sign that I should back off a bit? Or is it safe to continue?
2) Are there any particular signs that I should watch out for when reloading for semi auto rifles?
3) Can any one recommend a good powder for 9.3x62 that also has an appropriate burn rate for a semi auto?
 
Speer Reloading manual No.11 recommends medium burn rate powders for auto-loaders (p.78-79)..."extremely fast or slow burning powders will not work well. The medium burning rate powders usually work best..."
 
I see a few dented case mouths sometimes with my Remington 7400 35 Whelen auto-loader. Seems the cases are hitting the sides of the ejection port on the way out sometimes. Not sure if that's an issue with my rifle as long as a jam doesn't happen. My 7400 seems to like Reloder15.

The Woodleigh Bullets reloading manual lists loads for the 9.3x62 using Re15.
 
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My powder of choice (and often recommended) is 4064. I've put a few hundred rounds through a Garand , Browning BAR and Norinco M14.
A lessor number in an SVT40 and Swedish 42B. No problems with any of them.
 
If compressed loads are the issue, you want a fine powder like RL15. 4064 would be very bulky.

A ball powder like 748 or H380 would be worth a try.

When I load for a semi, I full length size and work up a load, looking for a load that groups well. Usually some loads will be much better/worse than others.
 
I just started loading for my 9.3x62 bolt gun, and Varget seems promising. Basically full to just below the shoulder (mid range load) so little or no compression and room for a bit more powder to hit max if required. It's a recommended auto loader powder as well.
 
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