problems reloading 10mm

[mil-spec II]

Just purchased a glock 20 and have started reloading for it, my problem is when i seat the bullet i am getting a small bulge below the bullet. I am using lee dies and 155 gr. XTP bullets with winchester brass and a COL of 1.25. IS this dangerous in my gun?

 

[Certaindeaf]

That bulge is actually a very good thing. It shows that there is excellent tension holding the bullet. Make sure they pass the "plunk test" in your barrel. Other particulars regarding your load I can not comment on as I don't load for that..
if the data is in the book and you're working up the load, you should be good.

 

[ATLDave]

By "bulge below the bullet," do you mean that you can see the outline of the bullet through the brass? If so, then Certaindeaf has it - that's a sign the brass is nice and tight around the bullet.

If the bulge is lower down and not related to the bullet itself, that may reflect that your Glock is bulging the brass due to lack of support around the ramp (Glocks are notorious for this) and your die is not getting it sized out. That can problems. If that's what's happening, you may need a pass-through die, or a barrel with more support.

 

[918v]

Actually, if he's getting the bulge, his loads are excessive. Normal pressure loads do not cause the bulge. They cause normal case expansion.

 

[Jaxondog]

^^^
ditto; but should be fine if it pass's the plunk test

 

[gamestalker]

Buldge as in the area just below the bullet is larger in diameter, or smaller in diameter than space occupied bullet? If it's larger you have a problem. If the diameter is smaller in diameter below the bullet you have excellent case tension around that seated bullet, that's a good thing because it helps to prevent bullet set back caused by feeding and recoil.

GS

 

[hentown]

Actually, if he's getting the bulge, his loads are excessive. Normal pressure loads do not cause the bulge. They cause normal case expansion.

Actually, like the rest of us reloaders, he doesn't need to worry about excessive pressure while seating a bullet!

 

[ATLDave]

Actually, if he's getting the bulge, his loads are excessive. Normal pressure loads do not cause the bulge. They cause normal case expansion.

I suppose it depends on where you think the line between "bulge" and "normal case expansion" lies. A friend of mine had a G20 and shot loads closer to starting than max loads; his brass had so much expansion that it would grown in length during resizing such that it needed trimming after one or two firings. You can call that a bulge or case expansion or just a growth spurt, but I don't think overpressure was the cause.

 

[hentown]

Some of you guys seem to be having reading problems. He's not talking about a bulge while/after firing. He's talking about a "bulge" while seating. Want to rethink those answers, now??

 

[ATLDave]

That's why at least one of us asked what he meant by bulge.