More to Powder Than Meets the Eye
Sept 17, 2021 18:54:11 GMT -5
Post by ET on Sept 17, 2021 18:54:11 GMT -5
Fit to bore and cleanliness go hand and hand with sabot shooting IMO.
When we look at bore dimensions in a 50, we normally have a diameter land dimension of .500” and a groove dimension of .507-.508”. So, what would constitute a good bullet/sabot diameter dimension be for a good fit?
For me I have found a bullet/sabot diameter of .505” works best. With a .508” groove dimension that only leaves me with a .0015” clearance per groove. With a dirty powder it wouldn’t take long to fill the groove, packing carbon and create problems when it makes pressure contact with the sabot petal.
As seen from dry swabbing my bore after shots are fired one can see the level and rate of fouling from different powders. Well, I can say that 4759 was not a clean burning powder. It may perform well but will foul the bore faster than some other powders. Ideally one wants a clean burning powder that produces little fouling per shot. What I plan to do is start recording the degree of fouling by observation from the dry swabs taken after each shot from different powders.
While doing some research on powders there have been formula changes. One change (not new) is making a powder insensitive to temp change. The other change that is being worked on is an additive for copper fouling reduction. This might be of interest to sabot-less shooters.
www.bing.com/search?q=de-coppering+agent+in+powder&cvid=fd30828f31f846448740a2d3fd1768fa&aqs=edge.1.69i59i450l2.35933842j0j1&FORM=ANNTA1&PC=LCTS
When we look at bore dimensions in a 50, we normally have a diameter land dimension of .500” and a groove dimension of .507-.508”. So, what would constitute a good bullet/sabot diameter dimension be for a good fit?
For me I have found a bullet/sabot diameter of .505” works best. With a .508” groove dimension that only leaves me with a .0015” clearance per groove. With a dirty powder it wouldn’t take long to fill the groove, packing carbon and create problems when it makes pressure contact with the sabot petal.
As seen from dry swabbing my bore after shots are fired one can see the level and rate of fouling from different powders. Well, I can say that 4759 was not a clean burning powder. It may perform well but will foul the bore faster than some other powders. Ideally one wants a clean burning powder that produces little fouling per shot. What I plan to do is start recording the degree of fouling by observation from the dry swabs taken after each shot from different powders.
While doing some research on powders there have been formula changes. One change (not new) is making a powder insensitive to temp change. The other change that is being worked on is an additive for copper fouling reduction. This might be of interest to sabot-less shooters.
www.bing.com/search?q=de-coppering+agent+in+powder&cvid=fd30828f31f846448740a2d3fd1768fa&aqs=edge.1.69i59i450l2.35933842j0j1&FORM=ANNTA1&PC=LCTS
