Measuring
 

How would i measure the bore on my x-150? im thinking about having BS make some bullets for me to try out in it but the QLA has me thrown off on how to measure. I havea few GP bullets few and was thinking about pulling my breech plug, push the bullet down the bore and then push it back out the way it went in and measure off that. Would that be ok? Im having a big problem with the 2 stores not restocking the Great plains bullets fast enough for me and would like to give BS a try and then order in bulk.

RE: Measuring
 

Push an all lead conical that engages the rifling into the bore and then back out and measure off the lead slug.

RE: Measuring
 

If you already have an all lead conical that fits the way you want it, why wouldn't you just measure the diameter of one and order that diameter from Dan?

RE: Measuring
 

i use the great plains bullets and the are hard to get into the bore until it trims down to size. I just got it done and measured .511 off the lands. See what BS has in that size and order a few bullets in different grainage.

RE: Measuring
 

i just measured another bullet that i didnt push down the bore and its .511 1/2" So its not to far off. Im going to look for something in the 350-385 grain area.

RE: Measuring
 

Are you measuring the land to land or groove to groove? That sounds a lot more like groove to groove and you don't want anything that big. Use the smallest measure you can on thescraped in areasget (as long as the rifle has an even number of lands/grooves). Odd numbers get a little trickier and require a bit of math aside from the measuring.

You want to order no more than about .001 over land to land - in pure lead. And you'll want his #2 lube. Anything more than that size and you'll need a short-starter. Might as well get into the ease of slip-fit stuff.

Assuming your measure is true, rounding itup to .512 for groove to groove and assuming a .004" to .005" rifling depth - your land to land should be .502 to .504. Rifling depth could even be more so don't make any assumptions there.

RE: Measuring
 

i use the great plains bullets and the are hard to get into the bore until it trims down to size. I just got it done and measured .511 off the lands. See what BS has in that size and order a few bullets in different grainage

Just remember some bullets are made with oversized rings to grab the rifling and make a gas seal. Just shoot them and see how they do.

RE: Measuring
 

wow i just caught something. I was measuring at the tip end and i noticed that eachring on the bullet went from big to small to even smaller, i just measured the rear ring land/land and came up with .503"... Im a little lost on what size i should order.

RE: Measuring
 

sorry forgot, land to land = .503" - grove to grove = .500"

those numbers sound better?

RE: Measuring
 

FG

You are going to want the .503's - they will begem dandy.... If you cal Dan he will send you a sampler pack so get some.503's and .504's. I can not imagine you X150 is any tighter than my GM barrel and the .503's NE's work well init as well as Dan's .504's - thumb pressure then the ram rod.

RE: Measuring
 

If using a tapered conical such as the REAL, Maxi, or Great Plains, measure at the top band (reference picture) in the grooves along the bullet sides formed by the lands. Measure at points as near to 180 degrees opposed as you can.

some that would require a bit more illustrated below.

RE: Measuring
 

NO on those numbers. Land to land will be a smaller measure than groove to groove - always. Hope the above illustrations help... your bottom band may not be engaging enough to get any sort of decent measure - they often don't on tapered conicals.

RE: Measuring
 

Shoot, if i measure the top band, its .511 land and .500 groove.

groove: .500"


Land " top ring" .511"


Ive tried measuring every way i could think of and keep coming up with the same numbers.

RE: Measuring
 

Just got this back from Dan.

The reason you are getting different readings at different ends of the
bullet is the LGP bullet is tapered being smaller at the base than the
nose.
If you are going for a slip fit you will want your bullet to ride the
land
tops. This is the bore diameter and apparently in your rfile its .500"
If your getting a .511 measurment for the groove diameter that tells us
your
grooves are .0055" deep which seems normal to me.
I would guess that what you will end up with for a useable bullet
diameter
will be .500" to .501" I can do eather or both your call.



I just used the small hole calipers and measured that and it did come up as .500" So i think i'll go with Dan's .501" bullets to be on the safe side

RE: Measuring
 

Yes, but in your prior post you still have the grooves and lands backwards. :D If you are getting .500, then Dan is correct in his recommendation.

The only problem will be in shooting a .501 bullet in a rifle that has grooves as deep as yours - it may not fully or consistently obturate.If that were the case, you would notget the kind of accuracy youdesire. You can help yourself there with a wad or buffer material - and by going heavy on the bullet weight. If they STILL won't shoot as well as you like, a hollow base conical might prove a better choice.

Gets to be a bit of a guessing game when grooves are that deep and the overall consistency of your rifling is an unknown. Since you were doing pretty well with the Great Plains - your rifling is surely fairly well done.

RE: Measuring
 

Im going to just order 20 and see how they work and start there. He said something about a lyman mold he has and he can lube them in a .501 mold. For $8.05, its worth a giving them a try. If i didnt have so much of a problem finding the GP bullets i'd use them all of the time. But im going to give this a try and see how well they shoot.

RE: Measuring
 

What size do you think i should get UC? Im putting payment in the mail tomorrow and can always put in a note for another size.

RE: Measuring
 

I think you should try the 400 grainerssized to.501 for now.

RE: Measuring
 

You're thinking is OK! Just use a soft lead ball or bullet that is slightly oversize, and push it in from the breech, then after shoving it several inches up the bore, push it back out and use a mike to measure it!

RE: Measuring
 

X150

If you are bored and nothing else to do....

Measure the diameter of a PB for me would you? I aint got any of those things... measure the skirt right at the top also...

RE: Measuring
 

I liked X150's pics so well .... ah borrowed 'em. :D

RE: Measuring
 

Okay i got the land/grove all figured out.:DYou have to think backwards. land-land is .500 and the groove-groove is .511" Thats enough work for me today, my head hurts after that.

Sabot, i dont have any .50 powerbelts but i measured a .45 PB and its .449" and .456" at the plastic skirt.