Crimp groove: post cast boolits

[Catpop]

My Situation:
-Marlin 30-30 336 micro groove barrel
-unlimited FREE .312 170 gr flat point boolits (NOE mold I think)
-acceptable accuracy for hunting
-BUT necessary to seat boolit deeper in case to avoid boolit/rifling engraving.

Question:
Is there an easy method a crimp groove be cut into boolit to facilitate use into the above Marlin?
Or another idea to prevent boolit setback?

Thanks to all!

 

[dredd]

Sounds like you are needing a Bullet Cannelure Tool.

https://www.ch4d.com/products/equipment/bullet-tools/CanToo

This is just one example. I do not personally own one.

 

[troy fairweather]

Lee fcd, it will make a cannelure when you crimp

 

[243winxb]

https://leeprecision.com/reloading-dies/rifle-dies/factory-crimp-die

Lee die may work? Does the .312" diameter fit the chambers throat? If to big, bullets may have to be seated deeper.

 

[AJC1]

Cast bullet, just roll crimp right into the bullet. No big deal, do it all the time. A fcd definitely has enough force to create a grove and mess up a bullet. If that is your plan load a bunch and test accuracy before you go afield.

 

[Charlie98]

-BUT necessary to seat boolit deeper in case to avoid boolit/rifling engraving.

Seriously? Marlins aren't normally short-chambered in my experience.

What kind of load are you working up? What is your powder of choice, and your velocity expectation?

My Browning 71 does have the notorious Miroku short chamber barrel, and I seat those RCBS mold cast bullets right up in that rifling... no problem. I fretted about it at first, but a few of my cast bullet shooting friends told me not to worry about it. I load them over IMR3031 without problems.

 

[MEHavey]

just roll crimp right into the bullet. No big deal,

**** THIS ****
(just don't overdo it if you're simultaneously seating/crimping)

 

[Catpop]

Thanks for answers
Right now I’m slightly roll crimping into the bullet
These boolits might have been designed for 30 cal 173 gr military substitution? Just a guess.

 

[Charlie98]

These boolits might have been designed for 30 cal 173 gr military substitution? Just a guess.

Interesting... got a pic?

 

[mdi]

I never cared for roll crimping into the side of a bullet (I found that some 44 Magnum cases after firing had s bit of roll left in the case mouth. I kinda figgered the heavy crimp might have scraped the bullet as it exited the case. I didn't recover any bullets, all cast lead, and have read the cases swell on firing enough to lessen grip on the bullet, but I have no was of knowing for sure, so I just don't crimp the sides of bullets). I have a few Lee collet crimp dies that are reported to hold quite well when crimped on the bullet's side.

 

[AJC1]

If your getting free bullets one would consider getting the noe sizing system and test at .312, .311, and .310. Lots of 30-30 prefer .310. The bushings are like 7 dollars after you get the body and can be used on any other caliber of your choosing.

 

[Charlie98]

If your getting free bullets one would consider getting the noe sizing system and test at .312, .311, and .310. Lots of 30-30 prefer .310. The bushings are like 7 dollars after you get the body and can be used on any other caliber of your choosing.

I was kind of wondering if .312" isn't a little too big meself. A previous comment has me wondering if he's not (...or will be...) hitting the chamber throat... not necessarily the rifling. OP says 'military substitution' bullet, I'm thinking round nose with no defined driving band.

 

[Catpop]

Heres pic
I only guess military substitute because of 30 cal and 173 grain- didn’t mean to mislead.

 

[AJC1]

View attachment 1115167Heres pic
I only guess military substitute because of 30 cal and 173 grain- didn’t mean to mislead.

Looks like a party and close to the nlg bullet I'm going to try. Lead acording to the rcbs casting manual isn't fond of jump so into the lands would be preferd if you can extract and it doesn't bind up.

 

[Charlie98]

That's kind of what I thought they'd look like.

I'm actually in the process of working up a cast bullet load for a 336... a 173grn bullet, the Lyman 311041 bullet... that has a thin, wide driving band up front, but is pretty much the same as your bullet. I would have to see, but I don't think it's into the rifling when crimped in the groove. I have to run .310" bullets for good accuracy... .309" doesn't get it. I don't know how well a bigger .312" bullet would work in MicroGroove rifling... I probably wouldn't load a bunch up until you ran a few testers.

 

[Catpop]

Looks like a party and close to the nlg bullet I'm going to try. Lead acording to the rcbs casting manual isn't fond of jump so into the lands would be preferd if you can extract and it doesn't bind up.

Negative, couldn’t even close action when crimped in top groove. Ended up with boolit just off lands.
Testing 3 at a time.

 

[AJC1]

Negative, couldn’t even close action when crimped in top groove. Ended up with boolit just off lands.

Do whatever works, my rifle left my mom's at 5am this morning so I'll be following your lead, after I figure out headspace and size all these rounds I've been dying to prep. We can party in the 30-30 thread I make and share horror stories...