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Trim to length?

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Goosic View Drop Down
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    Posted: November 07 2018 at 9:01pm
The shots fired today we're evenly split between 15 brand new Remington cases and 15 Brand New Hornady cases. All thirty rounds had exactly 40.0 grains of Norma powder. All thirty cases are currently fire formed to the faux sniper rifle. I decided to check and see how far the cases stretched. Upon examination,I found something of interest to me,and maybe to some of you. The Hornady cases did not stretch. The Remington cases stretched a total of.0005". The only reason I can think of as to why this is? I really am the first one to fire this rifle. The owner before me,who is the son of the original owner claim neither had ever fired it. I have stated this in the past. This rifle has no inspector markings,no individual stampings,save for the square S,flaming bomb, No4Mk1* and the serial number. The bolt head is numbered #1 with a square S with machine marks on the face. It won't close on a Forrester field gauge. I am not claiming that I own a Savage No4 that fell through the cracks and ended up under my bed in a hard case. I'm just saying,it shoots too straight to not at least be somewhat of an oddball in that it was just squirrelled away after the plant ceased production and forgot about. The rifling still has reamer marks as does the chamber. Any input from you guys?
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britrifles View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 09 2018 at 6:59am
I've found that new cases typically don't stretch after the first firing on .303; mainly because the case body taper is a bit steeper than the chamber and the case shoulder position is fairly far back as compared to the chamber shoulder position. You will see the same thing after firing full length sized cases with the die screwed all the way in to touch the she!! holder.  I back the die out such that the shoulder is only bumped back a few thou.   I won't F/L size the case until I feel resistance when locking the bolt on a loaded cartridge. 
If you F/L size a case you will see it will lengthen a fair bit, which is why I trim after sizing. 
 
Might just be the dimensional differences between Hornady and R-P brass that made a slight difference in change in case length after firing.  Now, if your talking about different amount of case stretch after it's already been fire formed, that's a different story and likely related to the brass thickness, composition and/or hardness. 
 
 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: November 09 2018 at 8:34am
Yes mine usually shrink in length a little on first firing, then they slowly stretch back on following use.

Don't shoot till you see the whites of their thighs. (Unofficial motto of the Royal Air Force)
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