Re-throating a .30-30

[lind0001]

Guys:

How hard is it to lengthen the throat of a m-788 in .30-30? I want to use bullets other than the 311041. I have a 311284 that just casts the most perfect and round bullets, but the bore-riding nose won't chamber. It usually mikes in at .301. What I would like to do is open up the rifling just in front of the leade to .301 or so, and to not ream to bore diameter of .308. The only other solution is to have a custom mould made with a nose at .299-.300 so it would chamber and ride the lands as it chambers. Any ideas? Thanks

[2ndAmendmentNut]

Personally I would price how much it would be to lengthen the throat, then price a custom mold. Go with which ever one is cheaper. Sorry I can’t be of more help, no Idea really how much either would cost.

[HeavyMetal]

Keep in mind once the throat is longer you can't go back!

If your 788 is going to be a designated lead boolit shooter that's not going to be an issue but if you want to have it do"Double" duty you may want to rethink the custom mold part of your plan.

Another thought is someone on site may have a mold that will drop the boolits your looking for. Perhaps a trade for a few dozen may help you decide if this is a good idea or not before you change or order anything!

[captaint]

Yeah, I'm with Heavy. Once that rifle is modified, it's modified for good. You can always get a different mold. Just my take. Mike

[pdawg_shooter]

Some time ago I built a .458 Win. with a 1/22 twist Douglas for a paper patch bullet shooting. The barrel as supplied had a throat that just didnt work, forcing me to deep seat my bullets. I rented a throating reamer for 30 bucks and 30 minutes later I had the perfect paper patch barrel.

[Larry Gibson]

If that M788 shoots as is and considering you can't run down and buy another one nor get it factory rebarreled I would not ream that throat. I would instead either get a custom mould or simple size the bullet noses down to bore diameter. If not wanting to mess with that I would simply say; well looks like it isn't going to work with 311284 so what else is there? And then move on to what's next.

Larry Gibson

[runfiverun]

id try to resize the boolits nose first.
bump type die.

[Doc Highwall]

You could also see if somebody here has a boolit mould that cast a under size nose like what you are looking for.

[dbldblu]

I agree with run5run. I made a nose die that fits in my Lyman 450. It sizes boreriding noses to .300. This was because my thumb was getting tired trying to shove oversize bullets into a single shot rifle (Ruger #1 in 30-06). My 311284 has a .302 nose; try chambering a hard alloy version of one of those with your thumb!

[GabbyM]

About ten thousnad rounds down that bore and it will re throat itslef.

[mrbill2]

Guys:

How hard is it to lengthen the throat of a m-788 in .30-30? I want to use bullets other than the 311041. I have a 311284 that just casts the most perfect and round bullets, but the bore-riding nose won't chamber. It usually mikes in at .301. What I would like to do is open up the rifling just in front of the leade to .301 or so, and to not ream to bore diameter of .308. The only other solution is to have a custom mould made with a nose at .299-.300 so it would chamber and ride the lands as it chambers. Any ideas? Thanks

Buy another Lyman 311284 mold. If it's like the last Lyman molds I bought, it will cast smaller than the one you have.
Mr. Bill2

[beagle]

Okay guys, I agree, don't rethroat. Look for a tapered sizing die. Eagan made them and I guess any good machinist can as well. The one I have is a .310T.

They're a blank sizing die with a 1.5 degree taper. You nose first size the nose in a sizer using a flat top punch until the loaded cartridge will chamber. This also insures that the bullet gets agood straight seat in the rifling.

I had the same problem with the 311284 in a new Ruger #1 and also the RCBS 30-180-FN. I got a die from Eagan and my problem went away and accuracy improved immensly.

If you make one, you must eliminate the lube holes or the lead will extrude into it and tie up the die./beagle

[geargnasher]

Buy another Lyman 311284 mold. If it's like the last Lyman molds I bought, it will cast smaller than the one you have.
Mr. Bill2

Amen. I've actually done some figuring buying the next caliber up from what I need due to the last 3 or 4 being so badly undersized. Or maybe just have them shipped straight from Lyman to Erik Ohlen and have the drive bands cut before even trying to cast with them.

Lind, I agree with everyone who said leave the gun alone. With the plethora of good moulds out there, I would keep trying until I found a boolit that fit the gun, not the other way around. It's not like you are trying to fit a boolit to a revolver with undersized cylinder throats, if the gun has a tight leade then look for something like a bore-riding silhouette design that has a cylindrical nose sized to bore diameter so you can seat it as far into the barrel as you want and still align straight and tight.

Gear

[TAWILDCATT]

how about 311291 lyman.also lees 30 cal. :coffee: [smilie=1:

[lind0001]

Guys:

Thanks for all the input. I am going to go with Gabbym and just deep-seat my bullets. Eventually the throat will wear in. What's wrong with about 10,000 rounds of shooting fun?! That is if I don't run out of primers first!

[NHlever]

You can also try a different alloy. Sometimes that will shrink boolit diameter just enough to work. If you do seat the boolits out, make sure you have room to extract, and eject a loaded round. Don't ask me why this is fresh on my mind.