can some one explain to me what grms measure on a shotty case.

[mr williamson]

i always thought it was the weight/amount of shot? is this correct? and if grms are higher will it contain more powder aswell? cheers guys

carl

[Graham M]

i always thought it was the weight/amount of shot? is this correct? and if grms are higher will it contain more powder aswell? cheers guys

carl

Weight of shot. More shot usually = a slower burning powder, although if you were using the same powder you would use less.

G.M.

[mr williamson]

why do they use slower burning powder? is that why game cartrudges are often slower than competition cartridges?

[SPARKIE]

game carts are around 32gr clay carts 28gr

[Dangerzone]

why do they use slower burning powder? is that why game cartrudges are often slower than competition cartridges?

 

How fast can you throw a golf ball and how fast can you throw a cricket ball?

Answer is, you can throw a golf ball faster without ripping your arm out of its socket because it's lighter. Same principle applied to heavier game cartridges over lighter clay cartridges. Slow powder v fast...... cricket ball, slow build up or you would hurt yourself, golf ball, fast, flick arm motion, because its lighter, get it?

Edited August 18, 2012 by Dangerzone

[Blunderbuss]

why do they use slower burning powder? is that why game cartrudges are often slower than competition cartridges?

 

slower burning powder doesn't necessarily mean a lower velocity. Fast powder accelerates the shot to velocity very quickly and is 'all- burnt' in the first few inches of barrel length. A slower powder, particularly a progressive one, will reach its all-burnt point just before the muzzle. The shot is accelerated less sharply, because it takes the full barrel length to get up to speed but the muzzlle velocity could be the same or higher than for a faster powder. Cartridges loaded with slower powder usually feel more pleasant to shoot as as you get a push, rather than a sharp jolt in the shoulder.

[gamekeeper1960]

Unless I'm mistaken then the answer to your question is the marked grms wieght on a cartidge is for the shot wieght and nothing at all to do with powder .

[mr williamson]

thanks guys thats sorted now. cheers

[subsonicnat]

Hi Guys, Right Built a 4 Bore some years ago 4oz of BB`s ,, roughly a game load of BB`s:::

Black Powder, by the time the 286 BB`s have left the barrel I would NOT be wanting to stand in front of it, even if the SPEED is calibrated at 850 Fps.. ..

[Guest cookoff013]

slower burning powder doesn't necessarily mean a lower velocity. Fast powder accelerates the shot to velocity very quickly and is 'all- burnt' in the first few inches of barrel length. A slower powder, particularly a progressive one, will reach its all-burnt point just before the muzzle. The shot is accelerated less sharply, because it takes the full barrel length to get up to speed but the muzzlle velocity could be the same or higher than for a faster powder. Cartridges loaded with slower powder usually feel more pleasant to shoot as as you get a push, rather than a sharp jolt in the shoulder.

slower burning powders give higher speeds to larger shotweight at lower or safer pressures. slower burning powders need more pressure to burn and perform right.

sorry, but all cartridges burn in the chamber of the shotgun. go to the proof house and fire off a test load, the pressure event is all over in a few microseconds. not enough time for the shot to get out the chamber. this is with all powders for shotgun. this is often mistaken.

a slower powder needs a minimal pressure to burn well.

when powder and or flame is coming out the muzzel it is the unburnt powder that isnt burnt by the pressure generated from the cartridge components.

 

manufacturers load as cheap as possable up to a pressure that just works.. the primer goes off and burns the powder charge. if the pressure doesnt go high enough or long enough for the powder to burn clean for that powder type, then the smouldering flakes are ejected with the exaust gasses, thus appearing to be still burning. but its not.

i can confirm that burning powder out in the open and at 10000psi or more is a whole different ball game. thats the different pressures.

 

if you need any more explanations or clarification, give us a yell

[motty]

i always thought it was the weight/amount of shot? is this correct? and if grms are higher will it contain more powder aswell? cheers guys

carl

Aren't you the same bloke who had a pop at people for using a certain shotsize on pigeons?

If you are unsure as to what the grms on the side of a cartridge case refers to, then please don't advise/ have an opinion on what shells people should use.