Can i have your thoughts 0n this 45 colt boolit ?

[math]

Hi
I would like too have your help interpret the signs on this boolit. It might bee hard too see in the pictures but doo you think that the "skid" marks are unusual ? I see no signs of gas blowby and i have several groups that measures 45mm, but also sevreal groups there 1 or 2 shoots opens up the group too 75mmish. overal i find it gard to get good groups even when shooting sitting down, gun beetven my knees.

Distance 25m
Ruger Bisley 45 Colt 6" barel
Boolit weight: 252gr Lubed whit FELIX (homemade) Sized .452
Powder: 8Gr Vihtavuori 320 C.o.l 43,5mm Crimpt in the first grease grove

Any thoughts and ideas is welcomed
Regards
Mathias

http://i244.photobucket.com/albums/gg21/mathias1978/P2140004_zps561232cc.jpg

http://i244.photobucket.com/albums/gg21/mathias1978/P2140010_zpse37e9cf1.jpg

http://i244.photobucket.com/albums/gg21/mathias1978/P2140007_zps60ceb372.jpg

http://i244.photobucket.com/albums/gg21/mathias1978/P2140009_zps7b6b5cf4.jpg

[JonB_in_Glencoe]

How do the boolit bases look before loading them ?
if there is any imperfections in fillout of the base, that can throw a flier.
I am not that familier with Felix lube...and precise recipe you are using,
but a lube with too much slickness can throw a flier once every 4 to 6 shots.
Jon

[math]

A goog fillout is my main criteria when sorting thru my cast, i very rarly weigh them. If the base looks like this i keep them (picture taken before sizing) let me know what you think
Regards
Mathias

http://i244.photobucket.com/albums/gg21/mathias1978/P2140005_zps974fb34c.jpg

[454PB]

I see no majors flaws. 75mm is a little under 3", which is not all that bad for shooting without a solid rest.

[Harter66]

How about sizing? Do they match the throats? Are the throats larger than the groove? I had a BlackHawk that would throw 1 way out and 2 a little wide. I lapped the throats to match and removed an electric pencil burr it made all the difference.

[JonB_in_Glencoe]

A goog fillout is my main criteria when sorting thru my cast, i very rarly weigh them. If the base looks like this i keep them (picture taken before sizing) let me know what you think
Regards
Mathias

the bases look good, if you've used your felix lube before and have been successful, that's probably not the problem either. Is this ruger new to you ?

[math]

Well i have meassured my throats (can´t seem too find the data now so i my have to do it again) and found that they were the thinyist amount larger then the groove, s boolit sized .451 will not fall thru. I normaly use a Lee 452-200-SWC sized .452 and they thend too tuch eachother when fired sitting down, What wolud a good ratio between throats and groove bee ?

[runfiverun]

i think i would try just the bottom groove lubed.

another thing to really think about is neck tension on your cases.
if things feel different when seating a boolit segregate that case into another batch.

[BABore]

Your using a pretty low charge of a slow powder. Likely have powder position and ignition issues. As your boolit has no crimp groove, the primer could easily overcome neck tension and move the boolit varying distances before the powder lights. Might look for something in the Unique burn range. 8.5 to 10 grains of Unique is fine in the Bisley with a 250-260 grain boolit

[math]

Actually this was my first go with Felix been using LBT blue soft, but it looked like so much fun making my own :)
No have had it for some 12 years now..

[prs]

With lead boolits the cylinder throats should be at or just larger than bore diameter, or as you say groove diameter. It looks to me that your revolver is out of time and the boolits are scraping as they enter the barrel a bit out of alignment.

prs

[Harter66]

I'm told revolvers will shoot well if the throats are at least bore dia. With that said, the 5 revolvers I've worked w/were throated .001-2 over groove and were lapped to match the largest throat. Since you have other Boolits that shoot well I would venture to guess lube volume (these guys have more time in than me). I might wonder about such a slow powder behind that boolit. N120 being just faster than the 4227s. I don't have any data so I won't 2nd guess that. Your boolit looks like a BP boolit it would be pretty easy to "over lube" for your use.

[math]

Now have i sluged bore and cylinder and this is the numbers i got
Bore 11,45mm
5 throats 11,46
1 throat 11,45

Might be an idea to send it to a smith and open them just a little and check the timeing then ?

[math]

Oops the powder should be N320 and nothing else, post corected

[cbrick]

I wouldn't ream the throats, the dimensions are pretty good and a good rule of thumb is if it ain't broke don't fix it.

The lube grooves on your boolit look fairly small so I doubt it's carrying too much lube to effect accuracy at 25 yards. In your first picture it appears that the boolit took the rifling at an angle, in other words not concentric to the bore, more on one side than the other. Sizer & expander dies (bullet pull) could cause this as could the seating die. Checking bullet run out will tell you if the boolit is seated "crooked". Also, are you using a magnum primer? A standard primer is plenty where a magnum primer can expel the boolit from the case before powder ignition.

Rick

[fouronesix]

It's really hard to tell much from the bullets because of the lack of close up photo resolution and especially since they've been recovered after being fired into a media of some sort.

Really, 3" or less at 25 yards is pretty good for a 45 Colt Revolver- there may be some margin for improvement, hard to say.

The biggest problem I see in trying to communicate amongst all the posters including the OP is the "fast and loose" usage of the terms "bore diameter" and "groove diameter". The bore of a rifled gun has two diameters of interest. The bore diameter is the distance between the tops of opposing lands. The groove diameter is the distance between the bottoms of opposing grooves.

In a revolver, usually the best results are if the bullet is sized to about groove diameter up to about .001" larger than groove diameter. The cylinder throats need to be very close to that diameter. A bullet sized correctly to your revolver's groove diameter should be a nice, slip fit with a little friction through the cylinder throats.